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Kinetics and mechanism of leaching synthetic calaverite in cyanide solutions
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Abstract
Calaverite is a gold telluride species with the composition AuTe^sub 2^. Calaverite is usually characterized by an exceedingly slow dissolution rate in cyanide solution. Cyanidation of slurry containing synthetic calaverite (P^sub 90^ of 10 µm) was studied to determine the leaching kinetics and surface reactions. Alkalinity, dissolved oxygen, lead nitrate and sulfide minerals (pyrite and chalcopyrite) were among the leaching parameters studied. The reaction products at the su...
Related newspaper, magazine, and journal articles from HighBeam Research
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Leaching kinetics and mechanisms of surface reactions during cyanidation of gold in the presence of pyrite or stibnite
Minerals & Metallurgical Processing
; Abstract This paper quantifies the detrimental effects of pyrite and stibnite on gold leaching kinetics. Means to reduce the effect of these minerals by the addition of lead nitrate and oxygen are presented. A significant retarding effect was observed when the pyrite concentration was 20%. A
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Histological alterations observed in the gills and ovaries of Clarias gariepinus exposed to environmentally relevant lead concentrations.(INTERNATIONAL PERSPECTIVES)(Report)
Journal of Environmental Health
; Introduction Histopathology is the study of lesions or abnormalities on a cellular level. As an indicator of exposure to contaminants, histology constitutes a useful tool for assessing the degree of pollution, particularly for sublethal and chronic effects (Bernet, Schmidt, Meier, Burkhardt-Holm, &
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Reactions of gold and sulfide minerals in cyanide media
Minerals & Metallurgical Processing
; Abstract The effect of pyrite, pyrrhotite, chalcopyrite, realgar and arsenopyrite on gold dissolution in cyanide media was investigated. The cyanidation of synthetic gold ores in the presence of various concentrations of sulfides was studied under constant experimental conditions. A mineralogical
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 "AAP General News (Australia)")
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Vic: 70 workers evacuated after chemical spill
AAP General News (Australia)
; AAP General News (Australia) 05-16-2008 Vic: 70 workers evacuated after chemical spill Seventy workers have been evacuated from a transportation ...
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 "The News & Record (Piedmont Triad, NC)")
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COOPERATIVE EXTENSION SCHEDULES EVENTS.(REAL ESTATE)
The News & Record (Piedmont Triad, NC)
; ... to know about new developments, projects and changes in the Triad real estate and housing industry. Send news items to Meredith Barkley, News & Record, P.O. Box 20848, Greensboro, N.C. 27420; fax 373-7382 or call 373-7091.
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New internet service helps utilities inform 250 million customers. (American Water Works Association)(Brief Article)
Nation's Cities Weekly
; DENVER-- In order to meet changing standards in Environmental Protection Agency (USEPA) consumer protection regulations and help improve consumer information, the American Water Works Association (AWWA) today launched an Internet-based service that will help U.S. water utilities educate nearly 250
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FROM H TO O, NEW REPORTS LIST WHAT'S IN THE WATER
The Boston Globe
; ... suppliers are telling all under a new federal right-to-know law requiring them to explain in writing exactly what's in the water. The news is good in the region covered by South Weekly, with all 43 communities passing drinking water standards set by the federal Environmental ...
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The effect of Pb(NO^sub 3^)^sub 2^ addition on the processing of blended Fort Knox and True North ores at the Fort Knox mine, Alaska
Minerals & Metallurgical Processing
; Abstract Fairbanks Gold Mining Inc. (FGMI) began blending and processing True North ore at its Fort Knox mill on April 12, 2001. Gold extraction subsequently dropped from 88% to 71% during the last week of April 2001. Twenty-five percent of the gold values remaining in the leach tailings were
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A SIMPLE FIELD TEST FOR ACID VOLATILE SULFIDE IN SEDIMENTS.(Statistical Data Included)
Journal of the Tennessee Academy of Science
; ... that 7% of the watersheds in the United States pose potential risk to people who eat fish from them (Chemical & Engineering News, 1998). Many of the sediments in these waters contain toxic heavy metals such as lead, cadmium, copper, and mercury. These metals ...
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notes from the EDITORS
Mineralogical Record
; Cresson Vug Photo Found! Readers may recall the story of the wondrous "Cresson Vug," discovered on the 12th level of the Cresson mine, Cripple Creek district, Colorado in 1914 (see "The Cresson Vug, Cripple Creek," by Art Smith, Ed Raines and Leland Feitz back in vol. 16, no. 3). It measured 13.5
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